Cisco Systems SPA9000 manual Caring for Your Hardware, Codec Side of conversation Calls

Chapter 2 Getting Started

Implementing LVS

Table 2-1 Ethernet Bandwidth Budget for Off-Net VoIP Calling

	Approximate bandwidth budget for each
Codec	side of conversation	2 calls	4 calls	6 calls	8 calls
G.711	110 kbps	220 kbps	440 kbps	660 kbps	880 kbps
G.726-40	87 kbps	174 kbps	348 kbps	522 kbps	696 kbps
G.726-32	79 kbps	158 kbps	316 kbps	474 kbps	632 kbps
G.726-24	71 kbps	142 kbps	284 kbps	426 kbps	568 kbps
G.726-16	63 kbps	126 kbps	252 kbps	378 kbps	504 kbps
G.729	55 kbps	110 kbps	220 kbps	330 kbps	440 kbps

This table is based on the following assumptions:

•Bandwidth Calculated with No Silence Suppression

•20 Millisecond of payload per RTP packet

Note The use of silence suppression can reduce the average bandwidth budget by 30% or more.

For more information about bandwidth calculation, refer to the following websites:

http://www.erlang.com/calculator/lipb/

http://www.packetizer.com/voip/diagnostics/bandcalc.html

Caring for Your Hardware

The SPA9000, SPA400, and the SPA900 Series phones are electronic device that should not be exposed to excessive heat, sun, cold or water. To clean the equipment, use a slightly moistened paper or cloth towel. Do not spray or pour cleaning solution directly onto the hardware unit.

	Linksys SPA9000 Administrator Guide
Document Version 3.01		2-7